Understanding Estimated GFR and Related Kidney Function Markers
Learn about estimated GFR, how it relates to kidney function, and when to consult a doctor.
On this page · 6
Estimated Glomerular Filtration Rate (eGFR) is a key measure of kidney function. It helps determine how well your kidneys are filtering waste from your blood. Understanding eGFR and its related markers can assist in identifying potential kidney issues early.
What is eGFR?
The estimated Glomerular Filtration Rate (eGFR) is a calculation used to assess how well your kidneys are functioning. It estimates the rate at which your kidneys filter waste from the blood in milliliters per minute per 1.73 square meters of body surface area (mL/min/1.73m²). This measure is crucial because it helps identify how effectively your kidneys are cleaning your blood.
Why eGFR Matters
eGFR is an important indicator of kidney health. A normal eGFR is typically considered to be ≥90 mL/min/1.73m². An eGFR between 60 and 89 mL/min/1.73m² indicates mildly reduced kidney function, which may not require immediate treatment but should be monitored. If eGFR falls below 60 mL/min/1.73m², it may suggest chronic kidney disease, a more serious condition that requires medical attention.
Related Markers
In addition to eGFR, other markers can provide insight into kidney health:
- Serum Creatinine: This is a waste product from muscle metabolism filtered by the kidneys. High levels may indicate reduced kidney function.
- Blood Urea Nitrogen (BUN): This measures the amount of nitrogen in the blood that comes from urea, a waste product of protein metabolism. Elevated BUN levels can suggest impaired kidney function.
- Urine Albumin: The presence of albumin, a protein, in urine can be an early sign of kidney damage.
How to Read Your eGFR Result
Your eGFR result will fall into one of several categories:
- Normal (≥90 mL/min/1.73m²): Indicates normal kidney function.
- Mildly Reduced (60–89 mL/min/1.73m²): Suggests slightly reduced kidney function; monitoring is advised.
- Below 60 mL/min/1.73m²: May indicate chronic kidney disease, and further evaluation by a healthcare provider is recommended.
Frequently asked questions
What factors can affect my eGFR?
Age, sex, muscle mass, and certain medications can influence eGFR results. Always discuss these factors with your healthcare provider.
Can lifestyle changes improve my eGFR?
Yes, maintaining a healthy diet, staying hydrated, and managing blood pressure and blood sugar levels can support kidney health.
Is eGFR the only test for kidney function?
No, eGFR is often used alongside other tests like serum creatinine, BUN, and urine albumin to provide a comprehensive picture of kidney health.
When to see a doctor
Consult a doctor if your eGFR is below 60 mL/min/1.73m², as this may indicate chronic kidney disease. If you experience symptoms such as swelling, fatigue, or changes in urination, seek medical advice.
Decisions about your health should be made in consultation with your healthcare provider.